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-rw-r--r--src/hibernate-resume/hibernate-resume.c58
1 files changed, 58 insertions, 0 deletions
diff --git a/src/hibernate-resume/hibernate-resume.c b/src/hibernate-resume/hibernate-resume.c
new file mode 100644
index 0000000..1c7d917
--- /dev/null
+++ b/src/hibernate-resume/hibernate-resume.c
@@ -0,0 +1,58 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <stdio.h>
+#include <sys/stat.h>
+
+#include "alloc-util.h"
+#include "devnum-util.h"
+#include "fileio.h"
+#include "log.h"
+#include "util.h"
+
+int main(int argc, char *argv[]) {
+ struct stat st;
+ const char *device;
+ int r;
+
+ if (argc != 2) {
+ log_error("This program expects one argument.");
+ return EXIT_FAILURE;
+ }
+
+ log_setup();
+
+ umask(0022);
+
+ /* Refuse to run unless we are in an initrd() */
+ if (!in_initrd())
+ return EXIT_SUCCESS;
+
+ device = argv[1];
+
+ if (stat(device, &st) < 0) {
+ log_error_errno(errno, "Failed to stat '%s': %m", device);
+ return EXIT_FAILURE;
+ }
+
+ if (!S_ISBLK(st.st_mode)) {
+ log_error("Resume device '%s' is not a block device.", device);
+ return EXIT_FAILURE;
+ }
+
+ r = write_string_file("/sys/power/resume", FORMAT_DEVNUM(st.st_rdev), WRITE_STRING_FILE_DISABLE_BUFFER);
+ if (r < 0) {
+ log_error_errno(r, "Failed to write '" DEVNUM_FORMAT_STR "' to /sys/power/resume: %m", DEVNUM_FORMAT_VAL(st.st_rdev));
+ return EXIT_FAILURE;
+ }
+
+ /*
+ * The write above shall not return.
+ *
+ * However, failed resume is a normal condition (may mean that there is
+ * no hibernation image).
+ */
+
+ log_info("Could not resume from '%s' (" DEVNUM_FORMAT_STR ").", device, DEVNUM_FORMAT_VAL(st.st_rdev));
+ return EXIT_SUCCESS;
+}